/* $NetBSD: resize_lfs.c,v 1.14.18.1 2019/09/02 16:16:56 martin Exp $ */ /*- * Copyright (c) 2005 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Konrad E. Schroder . * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "partutil.h" static void usage(void) { errx(1, "usage: resize_lfs [-v] [-s new-size] [filesystem]"); } int main(int argc, char **argv) { char *rdev, *fsname, buf[LFS_SBPAD]; size_t rdevlen; daddr_t newsize, newnsegs; int devfd, rootfd; int ch, i, verbose; off_t secsize, sboff; struct disk_geom geo; struct dkwedge_info dkw; struct lfs *fs; struct statvfs vfs; /* Initialize and parse arguments */ verbose = 0; newsize = 0; while ((ch = getopt(argc, argv, "s:v")) != -1) { switch(ch) { case 's': /* New size, in sectors */ newsize = strtoll(optarg, NULL, 10); break; case 'v': ++verbose; break; default: usage(); } } fsname = argv[optind]; if (fsname == NULL) usage(); /* * If the user did not supply a filesystem size, use the * length of the mounted partition. */ if (statvfs(fsname, &vfs) < 0) err(1, "%s", fsname); rdevlen = strlen(vfs.f_mntfromname) + 2; rdev = malloc(rdevlen); if (getdiskrawname(rdev, rdevlen, vfs.f_mntfromname) == NULL) err(1, "Could not convert '%s' to raw name", vfs.f_mntfromname); devfd = open(rdev, O_RDONLY); if (devfd < 0) err(1, "open raw device"); /* * Read the disklabel to find the sector size. Check the * given size against the partition size. We can skip some * error checking here since we know the fs is mountable. */ if (getdiskinfo(rdev, devfd, NULL, &geo, &dkw) == -1) err(1, "%s: could not get info", rdev); secsize = geo.dg_secsize; if (newsize > dkw.dkw_size) errx(1, "new size must be <= the partition size"); if (newsize == 0) newsize = dkw.dkw_size; /* Open the root of the filesystem so we can fcntl() it */ rootfd = open(fsname, O_RDONLY); if (rootfd < 0) err(1, "open filesystem root"); /* Read the superblock, finding alternates if necessary */ fs = (struct lfs *)malloc(sizeof(*fs)); for (sboff = LFS_LABELPAD;;) { pread(devfd, buf, sboff, LFS_SBPAD); __CTASSERT(sizeof(struct dlfs) == sizeof(struct dlfs64)); memcpy(&fs->lfs_dlfs_u, buf, sizeof(struct dlfs)); if (sboff == LFS_LABELPAD && lfs_fsbtob(fs, 1) > LFS_LABELPAD) sboff = lfs_fsbtob(fs, (off_t)lfs_sb_getsboff(fs, 0)); else break; } close(devfd); /* Calculate new number of segments. */ newnsegs = (newsize * secsize) / lfs_sb_getssize(fs); if (newnsegs == lfs_sb_getnseg(fs)) { errx(0, "the filesystem is unchanged."); } /* * If the new filesystem is smaller than the old, we have to * invalidate the segments that extend beyond the new boundary. * Make the cleaner do this for us. * (XXX make the kernel able to do this instead?) */ for (i = lfs_sb_getnseg(fs) - 1; i >= newnsegs; --i) { char cmd[128]; /* If it's already empty, don't call the cleaner */ if (fcntl(rootfd, LFCNINVAL, &i) == 0) continue; snprintf(cmd, sizeof(cmd), "/libexec/lfs_cleanerd -q -i %d %s", i, fsname); if (system(cmd) != 0) err(1, "invalidating segment %d", i); } /* Tell the filesystem to resize itself. */ if (fcntl(rootfd, LFCNRESIZE, &newnsegs) == -1) { err(1, "resizing"); } if (verbose) printf("Successfully resized %s from %u to %lld segments\n", fsname, lfs_sb_getnseg(fs), (long long)newnsegs); return 0; }